Troutman III has four years of eligibility remaining.
Hayes was rated as a four-star recruit out of high school.
White came to Happy Valley from Texas A&M this season.
Dinkins has one year of eligibility remaining.
Askew is the 14th player to commit to the Nittany Lions this cycle.
The Glenside, Pennsylvania, native appeared in 12 games this season with the Mountaineers, recording 12 tackles and one tackle for loss as a true freshman.